JP2020072028A - Display device - Google Patents

Abstract

To preferably form a predetermined pattern.SOLUTION: A light guide plate 5 includes a conversion part 7 and an image formation part 9. The conversion part 7 converts incident light into collimated light. The image formation part 9 form a predetermined pattern with collimated light. The image formation part 9 is formed integrally with the conversion part 7.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a display device and equipment.

  A light source (light emitting unit) and a light guide plate are disclosed in a conventional display device (see Patent Document 1). The light guide plate is provided with a light converging unit (imaging unit). The light converging part is arranged at a predetermined position apart from the light source. In this display device, the irradiation light emitted from the light source to the light guide plate is reflected by the light converging portion, so that a predetermined pattern is imaged in space. On the other hand, in the conventional display device, a light source (light emitting unit) and a light guide (conversion unit) are disclosed (see Patent Documents 2-4). In this display device, the light guide body converts the irradiation light emitted from the light source into collimated light.

JP, 2016-114929, A JP, 2011-243521, A JP, 2013-137979, A JP, 2005-228502, A

  In recent years, a display device such as an LED panel or an optical fiber is sometimes used to express a complicated design. However, this type of display device is expensive, and a display device capable of expressing a complicated design at low cost is desired.

  Then, the inventor considered using the technique of forming the above-described predetermined pattern in space. In this case, since the light source and the light converging part are arranged apart from each other, the irradiation light of the light source may spread and reach the light converging part. Here, when the irradiation light of the light source spreads and reaches the light converging portion, there is a possibility that a predetermined pattern cannot be clearly displayed. In order to solve this problem, it is possible to use the above-mentioned collimated light as irradiation light.

  As described above, in order to form an image of a predetermined pattern in space using the collimated light, it is necessary to arrange the light guide body for collimation and the light guide plate for image formation adjacent to each other. In this case, since a gap is created between the light guide for collimation and the light guide plate for image formation, the transmission efficiency of collimated light is reduced. Therefore, there is a possibility that the predetermined pattern desired by the designer cannot be formed into an image properly.

  Here, when the light guide for collimation and the light guide plate for image formation are arranged in close contact with each other, the light guide for collimation and the light guide plate for image formation are provided when vibration, impact, or the like is input to the display device. However, there is a risk that it may be worn by sliding or damaged by collision. Further, at this time, if the positional relationship between the light guide body for collimation and the light guide plate for image formation is deviated, there is a possibility that a predetermined pattern desired by the designer cannot be formed properly.

  Furthermore, since the light guide body for collimation and the light guide plate for image formation are manufactured separately from each other, the manufacturing process may be complicated and the manufacturing cost may increase.

The present invention has been made in view of the above problems, and an object of the present invention is to suitably form a predetermined pattern in a light guide plate, a display device, an input device, and a vehicle lighting device. It is in.
Another object of the present invention is to reduce the manufacturing cost of a light guide plate, a display device, an input device, and a vehicle lighting device.

  The light guide plate according to one aspect includes a conversion unit and an imaging unit. The converter converts the incident light into collimated light. The image forming unit forms an image of a predetermined pattern by the collimated light. The imaging unit is formed integrally with the conversion unit.

  In the light guide plate according to this aspect, since the conversion unit and the imaging unit are integrally formed, the collimated light can reach the imaging unit from the conversion unit without reducing the transmission efficiency of the collimated light. Further, with this configuration, it is possible to prevent abrasion and collision of the conversion unit and the imaging unit. Further, it is possible to prevent the displacement of the conversion unit and the imaging unit. Thus, the light guide plate according to this aspect can preferably form a predetermined pattern.

  Further, in the light guide plate according to this aspect, since the conversion unit and the image forming unit are integrally formed, the manufacturing process of the light guide plate is simplified as compared with the case where the conversion unit and the image forming unit are separately configured. Can be converted. That is, in the light guide plate according to this aspect, the manufacturing cost can be reduced.

  The conversion part may have a 1st main part and a reflective surface. In this case, the reflecting surface is provided on the first main body portion. The reflecting surface reflects the incident light to generate collimated light.

  The imaging unit has a second main body unit and a pattern generation unit. The second body portion is integrally formed with the first body portion. The pattern generation unit is provided in the second main body unit. The pattern generation unit images a predetermined pattern.

  With this configuration, since the first main body and the second main body are integrally formed, it is possible to allow the collimated light to reach the pattern generation unit from the reflection surface without reducing the transmission efficiency of the collimated light. Further, with this configuration, it is possible to prevent abrasion, collision, and positional deviation of the conversion unit and the imaging unit. Thus, the light guide plate according to this aspect can preferably form a predetermined pattern.

  The reflecting surface may be formed in an aspherical shape. With this configuration, it is possible to preferably convert the irradiation light into collimated light in the conversion unit.

  The reflective surface may have a plurality of recesses. With this configuration, it is possible to preferably convert the irradiation light into collimated light in the conversion unit.

  The conversion unit may have a plurality of reflecting surfaces that individually reflect a plurality of incident lights. With this configuration, each incident light is reflected by each reflection surface, so that the generation range of the collimated light can be expanded. That is, the display range of the predetermined pattern can be expanded.

  The reflecting surface may be formed such that the illuminance of the collimated light reaching the image forming unit is made uniform according to the illuminance of the incident light reaching the reflecting surface.

  With this configuration, the illuminance of the collimated light reaching the image forming section is made uniform, so that a predetermined pattern can be clearly formed in the image forming section. That is, the brightness of a predetermined pattern can be made uniform.

  The light guide plate may further include a wide-angle light removing unit that removes a wide-angle component of incident light. With this configuration, the illuminance of the collimated light can be made uniform. That is, the brightness of a predetermined pattern can be made uniform.

  The wide-angle light removing unit may be provided between the incident unit on which the incident light is incident and the conversion unit. With this configuration, the illuminance of the collimated light can be made uniform with a simple configuration.

  The wide-angle light removing unit may be provided in the converting unit. With this configuration, the illuminance of the collimated light can be made uniform with a simple configuration.

  The plurality of light emitting units may include a first light emitting unit that emits the first irradiation light and a second light emitting unit that emits the second irradiation light. In this case, the conversion unit has a first body, a first reflecting surface that reflects the first irradiation light, and a second reflecting surface that reflects the second irradiation light.

  The wide-angle light removing unit includes a first wide-angle light removing unit that removes the wide-angle component of the first incident light and a second wide-angle light removing unit that removes the wide-angle component of the second incident light. The first wide-angle light removing unit is provided on at least one of the first main body unit and the second reflecting surface. The second wide-angle light removing unit is provided on at least one of the first body unit and the first reflecting surface.

  With this configuration, the illuminance of the collimated light can be made uniform, and the generation range of the collimated light can be expanded. That is, it is possible to realize uniformization of the brightness of a predetermined pattern and expansion of the display range of the predetermined pattern at the same time.

  The reflecting surface may have a non-vapor-deposited third reflecting surface that reflects incident light, and a fourth reflecting surface that converts the reflected light reflected by the third reflecting surface into collimated light.

  With this configuration, since the third reflecting surface is not vapor-deposited, the manufacturing cost can be reduced. Here, when the fourth reflecting surface is not vapor-deposited, the manufacturing cost can be further reduced.

  The reflecting surface may further include a fifth reflecting surface that reflects the wide-angle component of the incident light. In this case, the third reflecting surface is arranged so that the reflected light reflected by the fifth reflecting surface can be transmitted.

  With this configuration, since the wide-angle component of the incident light is transmitted from the third reflecting surface, the illuminance of the collimated light can be made uniform. That is, the brightness of a predetermined pattern can be made uniform.

  The conversion unit may further include a transmissive surface that is arranged to transmit the wide-angle component of the incident light. With this configuration, since the wide-angle component of the irradiation light is transmitted from the transmitting surface, the illuminance of the collimated light can be made uniform. That is, the brightness of a predetermined pattern can be made uniform.

  A light blocking portion that blocks transmitted light may be provided on the transparent surface. In this configuration, when a plurality of light guide plates are arranged side by side, the transmitted light (wide-angle component of the incident light) transmitted from the transmission surface of each light guide plate is shielded by the shield.

  Thereby, the shielding portion can prevent the transmission light (the wide-angle component of the irradiation light) from entering from one light guide plate to another light guide plate adjacent to this light guide plate. That is, the illuminance of the collimated light can be made uniform in the plurality of light guide plates.

  The transmissive surface may be tapered. In this configuration, as described above, when a plurality of light guide plates are arranged side by side, the transmitted light (wide-angle component of irradiation light) transmitted from the transmission surface in each light guide plate is bent by the transmission surface.

  Thereby, the transmission surface can prevent the transmission light (the wide-angle component of the irradiation light) from entering from one light guide plate to another light guide plate adjacent to this light guide plate. That is, the illuminance of the collimated light can be made uniform in the plurality of light guide plates.

The first main body portion may have an incident portion on which incident light is incident. In this case, the incident part has a light intensity adjusting part for adjusting the light intensity distribution of the incident light. With this configuration,
In this configuration, since the luminous intensity distribution of the irradiation light is adjusted in the luminous intensity adjusting unit of the incident unit, the illuminance of the collimated light can be made uniform. That is, the brightness of a predetermined pattern can be made uniform.

  The light guide plate may further include a light limiting portion that limits diffusion of incident light. With this configuration, since the diffusion of the irradiation light is limited in the light limiting portion, the directivity of the incident light can be improved. Thereby, the conversion unit, for example, the reflecting surface can be downsized.

  The conversion unit may further include a light collecting unit that collects a plurality of incident lights. In this configuration, since the condensing unit condenses the plurality of incident lights, it is possible to generate the incident light with high illuminance.

  The predetermined pattern may be imaged in a direction intersecting the direction in which the collimated light travels. In this configuration, the predetermined pattern is displayed in the space provided in the direction intersecting the direction in which the collimated light travels. Accordingly, when the observer sees the predetermined pattern in the direction in which the collimated light travels, the conversion unit is not visible behind the image E, and thus the image E can be viewed appropriately. Moreover, the dead space or the like can be effectively utilized.

  The light guide plate may further include a light emitting portion that emits light around a predetermined pattern. With this configuration, the light emitting portion can increase the brightness around the predetermined pattern. That is, the brightness of the space in which the predetermined pattern is displayed can be increased.

  A display device according to one aspect includes the above-described light guide plate and a light-emitting body that emits incident light. Thereby, in the display device, the same effect as the above-described effect can be obtained.

  An input device according to one aspect includes the display device described above and a sensor unit that detects an object approaching a predetermined pattern. As a result, in the input device, the same effects as those described above can be obtained.

  An illumination device for a vehicle according to one aspect includes the above display device. As a result, the vehicle lighting device can obtain the same effects as those described above.

  According to the present invention, it is possible to preferably form a predetermined pattern in a light guide plate, a display device, an input device, and a vehicle lighting device.

The schematic diagram which shows the structure of the vehicle which concerns on 1st Embodiment. The schematic diagram which shows the structure of the display apparatus in 1st Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and video in 1st Embodiment. The block diagram which shows the structure of the display apparatus in 1st Embodiment. The schematic diagram of the display apparatus in the modification (A1) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A2) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A3) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A4) of 1st Embodiment. The schematic diagram of the wide-angle light removal part in the modification (A4) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A5) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A6) of 1st Embodiment. The schematic diagram of the display apparatus in the modification (A7) of 1st Embodiment. The schematic diagram which shows the structure of the display apparatus which concerns on 2nd Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and video in 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B1) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B2) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B3) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B4) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B5) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B6) of 2nd Embodiment. The schematic diagram of the display apparatus in the modification (B7) of 2nd Embodiment. The schematic diagram which shows the structure of the display apparatus which concerns on 3rd Embodiment. The schematic diagram which shows the structure of the display apparatus which concerns on 3rd Embodiment. The luminous intensity distribution of the luminous intensity adjustment part in 1st and 2nd embodiment. FIG. 7 is a luminous intensity distribution of the luminous intensity adjusting unit in the fourth embodiment. FIG. The schematic diagram which shows the structure of the light limitation part which concerns on 4th Embodiment. The schematic diagram which shows the structure of the light limitation part which concerns on 4th Embodiment. The schematic diagram which shows the structure of the light limitation part which concerns on 4th Embodiment. The schematic diagram which shows the structure of the light limitation part which concerns on 4th Embodiment. The schematic diagram which shows the structure of the light limitation part which concerns on 4th Embodiment. The schematic diagram which shows the structure of the condensing part which concerns on 5th Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and image which concern on 6th Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and image which concern on 6th Embodiment. The schematic diagram which shows the structure of the display apparatus which concerns on 7th Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and image | video which concern on 7th Embodiment. The schematic diagram which shows the positional relationship of the display apparatus and image | video which concern on 7th Embodiment. The schematic diagram which shows the structure of the display apparatus which concerns on other embodiment. The schematic diagram which shows the structure of the input device which concerns on other embodiment.

[First Embodiment]
Hereinafter, the display device 1 having the light guide plate 5 will be described with reference to the drawings. The display device 1 is used, for example, as a display device for tail lamps arranged on the left and right of the rear part of the vehicle C shown in FIG. That is, the display device 1 is included in a lighting device for a tail lamp. The display device 1 is arranged inside the lamp cover T of the tail lamp.

  The display device 1 displays an image E (an example of a predetermined pattern) in a space outside the display device 1. As shown in FIGS. 2A and 2B, the display device 1 includes a light source 3 (an example of a light emitting unit) and a light guide plate 5.

  In the present embodiment, as shown in FIG. 2B, an example in which the image E is displayed between the viewer and the light guide plate 5 is shown. For example, the image E is displayed on the exit surface 9c side of the light guide plate 5. The image E may be displayed between the lamp cover T and the light guide plate 5 as shown in FIG. 2B, or may be displayed outside the lamp cover T. Further, the image E may be displayed so that the light guide plate 5 is located between the observer and the image E. That is, the image E is displayed on the back side of the light guide plate 5.

  In the present embodiment, the direction in which the collimated light (described later) travels is defined as the Y direction. The directions orthogonal to the Y direction are defined as the X direction and the Z direction. The Z direction corresponds to the thickness direction of the conversion unit 7. The X direction corresponds to the width direction of the conversion unit.

<Light source>
The light source 3 is arranged adjacent to the light guide plate 5. The light source 3 irradiates the light guide plate 5 with light. The light source 3 has an optical axis K. The optical axis K is an axis extending in the direction normal to the emission surface of the light source 3 (direction perpendicular to the emission surface).

  The light source 3 is controlled based on a control signal from the controller 50 (described later). The light source 3 is, for example, an LED (Light Emitting Diode). However, the light source 3 is not limited to the LED, and may be another light source 3 such as an OLED (Organic Light Emitting Diode).

  As shown in FIG. 3, the controller 50 includes a processor 51 such as a CPU (Central Processing Unit) and a memory 52 such as a RAM (Random Access Memory) and a ROM (Read Only Memory). The memory 52 stores instructions executed by the processor 51 and data for controlling the light source 3. The controller 50 controls the light source 3, for example.

<Light guide plate>
The light emitted from the light source 3 enters the light guide plate 5. The light guide plate 5 converts the incident light into collimated light and forms an image E by the collimated light. The light guide plate 5 is formed of a translucent material. For example, the light guide plate 5 is preferably formed of a transparent resin such as polymethylmethacrylate (PMMA), polycarbonate, or a cycloolefin polymer, and a material such as glass.

  As shown in FIGS. 2A and 2B, the light guide plate 5 includes a conversion unit 7 and an image forming unit 9.

(Conversion part)
The conversion unit 7 converts incident light into collimated light. For example, the conversion unit 7 converts the irradiation light emitted from the light source 3 into collimated light. As shown in FIGS. 2A and 2B, the conversion unit 7 has a first main body unit 7a, a first incident surface 7b (an example of an incident unit), and a reflection surface 7c.

  The first main body portion 7a is provided between the reflecting surface 7c and the image forming portion 9. The first main body portion 7a guides the irradiation light emitted from the light source 3 to the reflecting surface 7c, and guides the collimated light generated by the reflecting surface 7c to the image forming portion 9.

  The first incident surface 7b is provided on the first main body portion 7a. The light source 3 is arranged to face the first incident surface 7b. Irradiation light from the light source 3 is incident on the first incident surface 7b.

  The reflective surface 7c is provided on the first main body portion 7a. The reflecting surface 7c generates collimated light by reflecting the light emitted from the light source 3. The reflecting surface 7c is formed in a shape capable of generating collimated light, for example, an aspherical shape. Aspherical shapes include paraboloids, hyperboloids, ellipsoids, and the like.

  The reflective surface 7c is subjected to a vapor deposition process. For example, the reflecting surface 7c is formed by a vacuum evaporation mirror using vacuum evaporation plating. The reflective surface 7c is formed by subjecting the base material to vacuum vapor deposition plating. For example, an adhesive layer is arranged so as to overlap the base material of the reflecting surface 7c. The vapor deposition layer is arranged so as to overlap the adhesion layer. A protective layer is arranged so as to overlap the vapor deposition layer.

  Note that, here, an example in which the reflective surface 7c is subjected to vapor deposition processing is shown, but the reflective surface 7c may be subjected to sputtering processing. In the sputtering process, the reflection film adheres to the base material by generating glow discharge while the base material is placed in a vacuum device. Thus, the reflecting surface 7c can also be formed by the sputtering process.

(Image forming part)
As shown in FIGS. 2A and 2B, the image forming unit 9 is formed integrally with the converting unit 7. The image forming unit 9 forms an image E by the collimated light. Specifically, the collimated light is incident on the imaging unit 9 from the conversion unit 7. The image forming unit 9 forms an image E by the collimated light. For example, the image E is imaged in the space outside the imaging unit 9 in the direction intersecting the direction in which the collimated light travels. In the present embodiment, the image E is imaged in the space outside the imaging unit 9 in the Z direction.

  The imaging unit 9 includes a second main body unit 9a and an image generation unit 9b (an example of a pattern generation unit). The second body portion 9a is formed integrally with the first body portion 7a. In the present embodiment, the second main body portion 9a is formed integrally with the first main body portion 7a on the same plane. The second main body 9a is formed integrally with the first main body 7a so as to face the reflecting surface 7c. The second main body 9a guides the collimated light to the image generation unit 9b, and guides the light reflected by the image generation unit 9b to the emission surface 9c.

  The image generator 9b forms the image E. The image generation unit 9b is provided in the second main body unit 9a. For example, the image generation unit 9b includes a plurality of prisms. The plurality of prisms are provided on the back surface of the second main body portion 9a. Since a known technique can be used for the configuration of the plurality of prisms, the description thereof is omitted here.

  The image generation unit 9b changes the optical path of the collimated light by reflecting the collimated light, and forms the image E at a position away from the second main body unit 9a. For example, the light reflected by the image generation unit 9b (for example, a plurality of prisms) passes through the second main body unit 9a and is emitted from the emission surface 9c. By converging this light, the image E is formed.

  In this way, the image generation unit 9b forms the image E in the space outside the image formation unit 9 by reflecting the collimated light. Note that a known technique can be used to form the image E of the image E, and thus the description thereof is omitted here.

<Summary>
In the display device 1 having the above configuration, the conversion unit 7 (first main body unit 7a) and the imaging unit 9 (second main body unit 9a) are integrally formed, so that the transmission efficiency of collimated light is not reduced. The collimated light can reach the imaging unit 9 (image generation unit 9b) from the conversion unit 7 (reflection surface 7c). Accordingly, the display device 1 can appropriately form the image E.

  Further, with this configuration, it is possible to prevent abrasion and collision of the conversion unit 7 and the imaging unit 9. Further, it is possible to prevent the displacement of the conversion unit 7 and the imaging unit 9 from occurring. Accordingly, the display device 1 can appropriately form the image E.

  Further, with this configuration, the manufacturing process of the light guide plate 5 can be simplified as compared with the case where the imaging unit 9 is configured separately from the conversion unit 7. That is, in the display device 1, the manufacturing cost can be reduced.

  Further, the image E can be displayed in the space outside the image forming unit 9 in the direction intersecting the traveling direction of the collimated light. In this case, when the observer sees the image E in the traveling direction of the collimated light, the display device 1 is not seen behind the image E, so that the image E can be suitably viewed. Moreover, the dead space or the like can be effectively utilized.

<Modification of First Embodiment>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  (A1) In the above embodiment, an example in which the display device 1 has one light guide plate 5 is shown. Instead of this, as shown in FIG. 4, the display device 1 may include a plurality of light guide plates 5.

  In this case, the plurality of light guide plates 5 are arranged side by side in one direction. The plurality of light guide plates 5 are arranged adjacent to each other on the same plane. For example, the plurality of light guide plates 5 are arranged side by side in the X direction. In addition, although an example in which the plurality of light guide plates 5 are arranged one-dimensionally is shown here, the plurality of light guide plates 5 may be arranged two-dimensionally.

  (A2) In the above embodiment, an example is shown in which the display device 1 has one light source 3 and the conversion unit 7 has one reflection surface 7c. Alternatively, as shown in FIG. 5A, the display device 1 may include a plurality of light sources 3 and the conversion unit 7 may include a plurality of reflecting surfaces 7c. In this case, the plurality of reflection surfaces 7c individually reflect the irradiation light from the plurality of light sources 3. The conversion unit 7 having a plurality of reflection surfaces 7c is formed integrally with the imaging unit 9.

  In this way, a plurality of collimated light beams are generated by individually reflecting the irradiation light of the plurality of light sources 3 by the plurality of reflecting surfaces 7c. With this configuration, the generation range of collimated light can be expanded. That is, the display range of the image E can be expanded.

  (A3) In the above embodiment, an example in which the display device 1 has one light source 3 and the conversion unit 7 has one reflection surface 7c has been shown. Alternatively, as shown in FIG. 5B, the display device 1 may include a plurality of light sources 3 and the conversion unit 7 may include a plurality of reflecting surfaces 7c.

  In this case, the conversion unit 7 having the plurality of reflection surfaces 7c is formed integrally with the imaging unit 9. The plurality of reflecting surfaces 7c individually reflect the irradiation light from the plurality of light sources 3. For example, the plurality of light sources 3 includes a first light source 3a and a second light source 3b. The plurality of reflecting surfaces 7c has a first reflecting surface 7c1 and a second reflecting surface 7c2.

  The first light source 3a irradiates the first reflecting surface 7c1 and is reflected by the first reflecting surface 7c1. In this way, the first collimated light is generated by reflecting the first light source 3a by the first reflecting surface 7c1. The second light source 3b irradiates the second reflecting surface 7c2 and is reflected by the second reflecting surface 7c2. In this way, the second collimated light is generated by reflecting the second light source 3b by the second reflecting surface 7c2.

  With this configuration, the generation range of collimated light can be expanded. That is, the display range of the image E can be expanded.

  (A4) The display device 1 of the above embodiment may further include a wide-angle light removing unit 11 that removes the wide-angle component of the irradiation light. In this case, as shown in FIG. 6A, the wide-angle light removing unit 11 is provided, for example, between the light source 3 and the converting unit 7. Here, an example is shown in which the wide-angle light removing unit 11 is formed integrally with the converting unit 7, but the wide-angle light removing unit 11 may be provided separately from the converting unit 7.

  As shown in FIG. 6B, the wide-angle light removing unit 11 has a second incident surface 11a and a light removing surface 11b. The irradiation light emitted from the light source 3 (the first light source 3a and the second light source 3b) is incident on the second incident surface 11a. At this time, irradiation light (low-angle light) around the optical axis K of the light source 3 enters the conversion unit 7. On the other hand, the wide-angle component of the irradiation light, for example, the irradiation light (wide-angle light) away from the optical axis K of the light source 3 passes through the light removal surface 11b.

  The wide-angle light removed by the wide-angle light removing unit 11 may be incident on another light guide member. Accordingly, the wide-angle light removed by the wide-angle light removing unit 11 can be used in another light guide member or can be guided to another space using another light guide member.

  The light guide angle of the low-angle light that enters the conversion unit 7 is preferably in the range of less than 60 degrees including the optical axis K. For example, the light guide angle of the low-angle light incident on the conversion unit 7 is preferably in the range of less than 30 degrees from the optical axis K.

  The light guide angle of the wide-angle light removed by the light removing surface 11b is preferably in the range of 60 degrees or more including the optical axis K. For example, the light guide angle of the wide-angle light that is removed by the light removal surface 11b is preferably in the range of 30 degrees or more from the optical axis K.

  Here, the light removal surface 11b may be configured to be able to absorb the wide-angle component of the irradiation light. For example, a member capable of absorbing a wide-angle component of irradiation light may be attached to the light removal surface 11b. The light removing surface 11b may be coated with a material capable of absorbing a wide-angle component of irradiation light.

  With this configuration, the illuminance of the irradiation light can be made uniform with a simple configuration. That is, the collimated light can be generated by the irradiation light whose illuminance is made uniform, and the brightness of the image E can be made uniform.

  (A5) The display device 1 of the above embodiment may further include a wide-angle light removing unit 11 that removes the wide-angle component of the irradiation light. In this case, as shown in FIG. 7, the wide-angle light removal unit 11 is provided in the conversion unit 7, for example. In FIG. 7, the wide-angle light removing section 11 is provided on the first main body section 7a and the reflecting surface 7c. Specifically, the first main body portion 7a and the reflective surface 7c are configured such that a part of the first main body portion 7a and a part of the reflective surface 7c function as the wide-angle light removing portion 11.

  For example, the wide-angle light removing unit 11 of the first main body 7a and the wide-angle light removing unit 11 of the reflecting surface 7c are configured to be able to transmit the wide-angle component of the irradiation light. Specifically, the emission area 11c for emitting the wide-angle component of the irradiation light from the inside of the first main body portion 7a to the outside is formed in the first main body portion 7a. The emission area 11c functions as the wide-angle light removing portion 11 of the first main body portion 7a. Further, the non-evaporated surface 11d is formed on the reflective surface 7c by not performing a vapor deposition process on a part of the reflective surface 7c by masking or the like. This non-deposited surface 11d functions as the wide-angle light removing unit 11 of the reflecting surface 7c.

  Here, the wide-angle light removing unit 11 of the first main body 7a and the wide-angle light removing unit 11 of the reflecting surface 7c may be configured to be able to absorb the wide-angle component of the irradiation light. For example, a material capable of absorbing a wide-angle component of irradiation light may be applied to the emission area 11c of the first main body portion 7a and the non-evaporated surface 11d of the reflection surface 7c. A member capable of absorbing a wide-angle component of irradiation light may be attached to the emission area 11c of the first main body portion 7a and the non-evaporated surface 11d of the reflection surface 7c.

  The light guide angle of the wide-angle component (wide-angle light) of the irradiation light removed by the wide-angle light removing section 11 is preferably in the range of 60 degrees or more including the optical axis K. For example, the light guide angle of the wide-angle light removed by the wide-angle light removing unit 11 is preferably in the range of 30 degrees or more from the optical axis K.

  Further, the light guide angle of the low-angle component (low-angle light) of the irradiation light incident on the conversion unit 7 is preferably in the range of less than 60 degrees including the optical axis K. For example, the low-angle light incident on the conversion unit 7 is preferably in the range of less than 30 degrees from the optical axis K.

  Here, an example in which the wide-angle light removing unit 11 is provided on the first main body portion 7a and the reflecting surface 7c is shown, but the wide-angle light removing unit 11 is not limited to the first main body portion 7a and the reflecting surface 7c. It may be provided on either side.

  With this configuration, the illuminance of the irradiation light can be made uniform with a simple configuration. That is, the collimated light can be generated by the irradiation light whose illuminance is made uniform, and the brightness of the image E can be made uniform.

  (A6) The display device 1 of the above embodiment may further include a wide-angle light removing unit 11 that removes the wide-angle component of the irradiation light.

  In this case, for example, as shown in FIG. 8, the plurality of light sources 3 include a first light source 3a that irradiates the first irradiation light and a second light source 3b that irradiates the second irradiation light. The conversion unit 7 includes a first main body 7a, a first reflection surface 7c1 that reflects the first irradiation light, and a second reflection surface 7c2 that reflects the second irradiation light.

  The wide-angle light removing unit 11 includes a first wide-angle light removing unit 12 and a second wide-angle light removing unit 13. The first wide-angle light removing section 12 is provided on the first main body section 7a and the second reflecting surface 7c2. The second wide-angle light removing portion 13 is provided on the first main body portion 7a and the first reflecting surface 7c1.

  The first wide-angle light removing unit 12 removes the wide-angle component of the first irradiation light. The second wide-angle light removing unit 13 removes the wide-angle component of the second irradiation light. The first wide-angle light removing unit 12 and the second wide-angle light removing unit 13 are configured, for example, in the same manner as (A4) and (A5) described above.

  The first wide-angle light removing unit 12 may be provided on either one of the first main body portion 7a and the second reflecting surface 7c2. The second wide-angle light removing unit 13 may be provided on either one of the first main body 7a and the first reflecting surface 7c1.

  With this configuration, the illuminance of the irradiation light can be made uniform. That is, the collimated light can be generated by the irradiation light whose illuminance is made uniform, and the brightness of the image E can be made uniform.

  The light guide plates 5 shown in FIG. 8 may be arranged side by side. In other words, the plurality of light guide plates 5 may be arranged side by side.

  (A7) The reflecting surface 7c of the above embodiment may be formed as follows. For example, as shown in FIG. 9, the reflecting surface 7c is formed such that the illuminance of the collimated light reaching the imaging unit 9 is made uniform according to the illuminance of the irradiation light reaching the reflecting surface 7c.

  For example, the reflecting surface 7c is formed so that the emission width H of the collimated light becomes narrower (H1> H2> H3> H4) as the irradiation light moves away from the optical axis K. Specifically, the reflecting surface 7c is formed such that the curvature increases as the optical axis K of the irradiation light moves away from the intersection that intersects the reflecting surface 7c. In other words, the reflecting surface 7c is formed along the curve having the above curvature.

  Further, in this case, for example, the reflecting surface 7c has a plurality of prisms 8 (an example of a plurality of concave portions) for generating the collimated light. Collimated light is generated by the plurality of prisms 8.

  In this structure, the illuminance of the collimated light is determined by the curvature of the reflecting surface 7c, and the collimated light is generated by the prism 8 of the reflecting surface 7c. As a result, collimated light having substantially the same illuminance in the direction (X direction) orthogonal to the traveling direction of the collimated light is generated by the reflecting surface 7c. That is, the illuminance of the collimated light reaching the image forming unit 9 is made uniform. Therefore, the image E can be clearly formed on the image forming unit 9. That is, the brightness of a predetermined pattern can be made uniform.

[Second Embodiment]
The basic configuration of the second embodiment is substantially the same as that of the first embodiment. Therefore, the configuration different from that of the first embodiment, for example, the configuration of the light guide plate 5 will be described below. The configuration omitted in the second embodiment is based on the description of the first embodiment.

<Light guide plate>
The light guide plate 5 converts the light emitted from the light source 3 into collimated light and forms an image E by the collimated light. As shown in FIGS. 10A and 10B, the light guide plate 5 includes a conversion unit 7 and an image forming unit 9.

  The conversion unit 7 converts the irradiation light emitted from the light source 3 into collimated light. The conversion part 7 has a first main body part 7a, a first incident surface 7b, and a reflection surface 7c. The conversion unit 7 is formed integrally with the imaging unit 9.

  The 1st main-body part 7a is integrally formed with the 2nd main-body part 9a similarly to 1st Embodiment. The first main body portion 7a is provided between the reflecting surface 7c and the image forming portion 9. The first main body portion 7a guides the irradiation light emitted from the light source 3 to the reflecting surface 7c, and guides the collimated light generated by the reflecting surface 7c to the image forming portion 9.

  The first incident surface 7b is provided on the first main body portion 7a, as in the first embodiment. The light source 3 is arranged to face the first incident surface 7b. Irradiation light is incident on the first incident surface 7b.

  The reflective surface 7c is provided on the first main body portion 7a. The reflecting surface 7c generates collimated light by reflecting the light emitted from the light source 3.

  The reflecting surface 7c totally reflects the irradiation light. For example, the reflective surface 7c is not vapor-deposited and is not vapor-deposited. The reflecting surface 7c is arranged such that the angle α (see FIG. 10A) formed by the light incident on the portion closest to the light source on the reflecting surface 7c and the reflecting surface 7c is larger than the critical angle. As a result, the light reaching the reflecting surface 7c from the light source 3 is totally reflected by the reflecting surface 7c.

  Here, the reflecting surface 7c is formed in an aspherical shape. For example, the reflecting surface 7c is formed in a parabolic column shape. When a plane including the optical axis K of the light source 3 and a straight line extending in the traveling direction of the collimated light is used as a cutting surface, the fourth reflecting surface 7c4 is formed in a parabolic shape. Thereby, when the irradiation light emitted from the light source 3 reaches the reflection surface 7c, the reflection surface 7c generates collimated light.

<Summary>
In the display device 1 having the above configuration, the conversion unit 7 (first main body unit 7a) and the imaging unit 9 (second main body unit 9a) are integrally formed, so that the transmission efficiency of collimated light is not reduced. The collimated light can reach the imaging unit 9 (image generation unit 9b) from the conversion unit 7 (reflection surface 7c). Accordingly, the display device 1 can appropriately form the image E.

  Further, with this configuration, it is possible to prevent abrasion and collision of the conversion unit 7 and the imaging unit 9. Further, it is possible to prevent the displacement of the conversion unit 7 and the imaging unit 9 from occurring. Accordingly, the display device 1 can appropriately form the image E.

  Further, with this configuration, the manufacturing process of the light guide plate 5 can be simplified as compared with the case where the imaging unit 9 is configured separately from the conversion unit 7. That is, in the display device 1, the manufacturing cost can be reduced.

  Further, the image E can be displayed in the space outside the image forming unit 9 in the direction intersecting the traveling direction of the collimated light. In this case, when the observer sees the image E in the traveling direction of the collimated light, the display device 1 is not seen behind the image E, so that the image E can be suitably viewed. Moreover, the dead space or the like can be effectively utilized.

<Modification of Second Embodiment>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  (B1) In the above embodiment, an example in which the display device 1 has one light source 3 and one light guide plate 5 is shown. Instead of this, as shown in FIG. 11, the display device 1 may include a plurality of light guide plates 5.

  In this case, the plurality of light guide plates 5 are arranged side by side in one direction. The plurality of light guide plates 5 are arranged adjacent to each other on the same plane. For example, the plurality of light guide plates 5 are arranged side by side in the X direction.

  In addition, although an example in which the plurality of light guide plates 5 are arranged one-dimensionally is shown here, the plurality of light guide plates 5 may be arranged two-dimensionally.

  (B2) In the above embodiment, an example is shown in which the display device 1 has one light source 3 and the conversion unit 7 has one reflection surface 7c. Alternatively, as shown in FIG. 12, the display device 1 may include a plurality of light sources 3 and the conversion unit 7 may include a plurality of reflecting surfaces 7c. In this case, the plurality of reflection surfaces 7c individually reflect the irradiation light from the plurality of light sources 3. The conversion unit 7 having a plurality of reflection surfaces 7c is formed integrally with the imaging unit 9.

  In this way, a plurality of collimated light beams are generated by individually reflecting the irradiation light of the plurality of light sources 3 by the plurality of reflecting surfaces 7c. With this configuration, the generation range of collimated light can be expanded. That is, the display range of the image E can be expanded.

  (B3) The display device 1 of the above-described embodiment may further include a wide-angle light removing unit 11 that removes a wide-angle component of irradiation light. In this case, as shown in FIG. 13, the wide-angle light removing unit 11 is provided, for example, between the light source 3 and the converting unit 7. The wide-angle light removal unit 11 may be formed integrally with the conversion unit 7, or may be provided separately from the conversion unit 7.

  This configuration is substantially the same as the configuration of (A3) described above, and therefore the description thereof is omitted here. With this configuration, the illuminance of the irradiation light can be made uniform with a simple configuration. That is, the collimated light can be generated by the irradiation light whose illuminance is made uniform, and the brightness of the image E can be made uniform.

  (B4) The reflecting surface 7c of the above embodiment may be configured as follows. As shown in FIG. 14, the reflection surface 7c includes a non-evaporated third reflection surface 7c3 that reflects irradiation light and a non-evaporated fourth reflection surface 7c4 that reflects the reflection light reflected by the third reflection surface 7c3. Have. The reflection surface 7c further has a non-evaporated fifth reflection surface 7c5 that reflects the wide-angle component of the irradiation light.

  That is, the reflection surface 7c totally reflects the irradiation light, the third reflection surface 7c3, the fourth reflection surface 7c4 that totally reflects the reflection light reflected by the third reflection surface 7c3, and the wide-angle component of the irradiation light. And a fifth reflecting surface 7c5.

  The third reflection surface 7c3 is arranged such that the angle formed with the optical axis K of the light source 3 is larger than the critical angle. As a result, the light reaching the third reflecting surface 7c3 from the light source 3 is totally reflected by the third reflecting surface 7c3.

  The fourth reflecting surface 7c4 is arranged such that the angle formed with the optical axis K of the reflected light reflected by the third reflecting surface 7c3 is larger than the critical angle. As a result, the light reaching the fourth reflecting surface 7c4 from the third reflecting surface 7c3 is totally reflected by the fourth reflecting surface 7c4.

  Here, the fourth reflecting surface 7c4 is formed in an aspherical shape. For example, the fourth reflecting surface 7c4 is formed in a parabolic column shape. The fourth reflecting surface 7c4 is formed in a parabolic shape on the XY plane. Thereby, when the reflected light totally reflected by the third reflecting surface 7c3 reaches the fourth reflecting surface 7c4, collimated light is generated by the fourth reflecting surface 7c4.

  The fifth reflecting surface 7c5 is arranged at a predetermined angle with respect to the first incident surface 7b. Here, the fifth reflecting surface 7c5 extends in a direction (Y direction) perpendicular to the first incident surface 7b. One end of the fifth reflecting surface 7c5 is connected to the first incident surface 7b.

  The fifth reflecting surface 7c5 is arranged so as to be able to reflect the wide-angle component (wide-angle light) of the irradiation light. For example, the fifth reflection surface 7c5 preferably reflects wide-angle light having a light guide angle in the range of 60 degrees or more including the optical axis K. In other words, the fifth reflection surface 7c5 preferably reflects wide-angle light having a light guide angle in the range of 30 degrees or more from the optical axis K.

  The low-angle component (low-angle light) of the irradiation light is incident on the third reflection surface 7c3 and reflected by the third reflection surface 7c3. The low-angle light guide angle of the irradiation light is preferably in the range of less than 60 degrees including the optical axis K. In other words, the light guide angle of the low-angle light of the irradiation light is preferably within the range of less than 30 degrees from the optical axis K.

  Further, the third reflecting surface 7c3 is arranged so that the reflected light (wide-angle light) reflected by the fifth reflecting surface 7c5 can be transmitted. That is, the third reflection surface 7c3 is arranged so as to reflect the low-angle light of the irradiation light and transmit the wide-angle light reflected by the fifth reflection surface 7c5.

  In this configuration, the wide-angle light reflected by the fifth reflection surface 7c5 is transmitted through the third reflection surface 7c3, and the low-angle light of the irradiation light is totally reflected by the third reflection surface 7c3. The fourth reflection surface 7c4 uses the low-angle light totally reflected by the third reflection surface 7c3 to generate collimated light. Thereby, the illuminance of the collimated light can be made uniform. That is, the brightness of the image E can be made uniform.

  (B5) The conversion unit 7 of the above-described embodiment may further include a transmission surface 7d that is arranged so as to be able to transmit the wide-angle component of the irradiation light. For example, as shown in FIG. 15A, the transmissive surface 7d is arranged so as to face the first incident surface 7b. The transmitting surface 7d transmits the wide-angle component (wide-angle light) of the irradiation light. In other words, the transmission surface 7d is arranged so that the wide-angle light of the irradiation light can be transmitted. The light guide angle of the wide-angle light of the irradiation light is preferably in the range of 60 degrees or more including the optical axis K. In other words, the light guide angle of the wide-angle light of the irradiation light is preferably in the range of 30 degrees or more from the optical axis K.

  In this configuration, the wide-angle light of the irradiation light is transmitted through the transmitting surface 7d, and the low-angle light of the irradiation light is totally reflected by the third reflecting surface 7c3. The fourth reflection surface 7c4 uses the low-angle light totally reflected by the third reflection surface 7c3 to generate collimated light. Thereby, the illuminance of the collimated light can be made uniform. That is, the brightness of the image E can be made uniform.

  (B6) The transparent surface 7d of the above-described embodiment, for example, the transparent surface 7d of (B5) above may be formed in a tapered shape. In this case, for example, as shown in FIG. 15B, when a plurality of light guide plates 5 are arranged side by side, the tapered transmission surface 7d is arranged to face the adjacent light guide plate 5.

  In this configuration, the wide-angle component (wide-angle light) of the irradiation light that has reached the transmitting surface 7d is bent and emitted from the transmitting surface 7d. Here, when the emission angle of the wide-angle light changes, the incident angle of the wide-angle light to the adjacent light guide plate 5 changes.

  As a result, it is possible to prevent wide-angle light from entering the adjacent light guide plate 5. That is, even if a plurality of light guide plates 5 are arranged side by side, stray light of wide-angle light can be prevented.

  (B7) The light-transmitting surface 7d of the above-described embodiment, for example, the light-transmitting surface 7d of (B5) above may be provided with a light-shielding portion 7f that blocks transmitted light. In this case, as shown in FIG. 15C, when a plurality of light guide plates 5 are arranged side by side, the light shielding portion 7f is arranged between the light guide plates 5 adjacent to each other, facing the transmission surface 7d.

  Thereby, the wide-angle component (wide-angle light) of the irradiation light emitted from the transmissive surface 7d can be shielded by the light-shielding portion 7f. That is, the wide-angle light emitted from the transmission surface 7d of a certain light guide plate 5 can be regulated by the light shielding portion 7f so as not to enter the adjacent light guide plate 5. Thereby, even if a plurality of light guide plates 5 are arranged side by side, it is possible to prevent stray light of wide-angle light.

[Third Embodiment]
The basic configuration of the third embodiment is substantially the same as that of the first and second embodiments. Therefore, a configuration different from the first and second embodiments, for example, the configuration of the first incident surface 7b will be described below. The configurations omitted in the third embodiment are similar to those described in the first and second embodiments.

  As shown in FIGS. 16A and 16B, the first incident surface 7b has a light intensity adjusting unit 7b1 that adjusts the light intensity distribution of the irradiation light. The light intensity adjusting unit 7b1 adjusts the light intensity of the irradiation light which is diffused light.

  For example, the light intensity adjusting unit 7b1 is provided on the first incident surface 7b. For example, as shown in FIG. 16A, the light intensity adjusting unit 7b1 has a plurality of prisms 7b2. Each of the plurality of prisms 7b2 is formed in a concave shape on the first incident surface 7b. Further, as shown in FIG. 16B, the light intensity adjusting portion 7b1 may have an arc-shaped recess 7b3. The arcuate recess 7b3 is formed on the first incident surface 7b.

  FIG. 17A is a light intensity distribution when the light intensity adjusting portion 7b1 is not formed on the first incident surface 7b. In the luminous intensity distribution of FIG. 17A, the peak value is formed at an acute angle. FIG. 17B is a light intensity distribution when the light intensity adjusting portion 7b1 is formed on the first incident surface 7b. In the luminous intensity distribution of FIG. 17B, the peak value is formed in a substantially curved shape.

  By forming the light intensity adjusting portion 7b1 on the first incident surface 7b as described above, it is possible to reduce the light intensity unevenness of the irradiation light. That is, it is possible to make the illuminance of the collimated light uniform by generating the collimated light by using the irradiation light with small unevenness of the light intensity. That is, the brightness of the image E can be made uniform.

[Fourth Embodiment]
The basic configuration of the fourth embodiment is substantially the same as that of the first to third embodiments. Therefore, in the following, a configuration different from the first to third embodiments will be described. The configurations omitted in the fourth embodiment are the same as those in the first to third embodiments.

  As shown in FIG. 18A, the display device 1 further includes a light limiting unit 15 that limits diffusion of irradiation light. The light limiting unit 15 is provided between the light source 3 and the reflecting surface 7c.

  In FIG. 18A, the light limiting unit 15 is provided between the light source 3 and the first incident surface 7b. For example, the light limiting section 15 has a light blocking structure 15a. The light blocking structure 15a has a light blocking body 15a1 and a light guide hole 15a2.

  The light shielding body 15a1 is arranged between the light source 3 and the first incident surface 7b. The light guide hole 15a2 is provided in the light shielding main body 15a1. The light guide hole 15a2 guides the irradiation light emitted from the light source 3 to the conversion unit 7 (for example, the first main body unit 7a). The light that has passed through the light guide hole 15a2 is incident on the conversion unit 7 (for example, the first incident surface 7b of the first main body portion 7a).

  Specifically, when the light source 3 irradiates the light guide hole 15a2 with the irradiation light, diffusion of the irradiation light is limited by the inner peripheral surface of the light shielding main body 15a1. Thereby, the directivity of the irradiation light can be improved. That is, the conversion unit 7, for example, the reflection surface 7c can be downsized.

<Modification of Fourth Embodiment>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  (C1) The light limiting unit 15 of the above embodiment may include a light bending lens 15b as shown in FIG. 18B. The light bending lens 15b is arranged between the light source 3 and the reflecting surface 7c.

  In this case, the irradiation light from the light source 3 is incident on the incident surface 15b1 of the light bending lens 15b. The exit surface 15b2 of the light bending lens 15b is formed to be convexly curved. The light passing through the light bending lens 15b is bent at the exit surface 15b2 of the light bending lens 15b so as to travel toward the conversion unit 7 (for example, the incident surface of the first main body portion 7a). In this way, the diffused light of the light source 3 is adjusted by the light bending lens 15b.

  Thereby, the directivity of the irradiation light can be improved. That is, the conversion unit 7, for example, the reflection surface 7c can be downsized.

  (C2) The light limiting section 15 of the above embodiment may be provided on the side surface of the first main body section 7a, as shown in FIG. 18C. In this case, the light limiting section 15 is composed of the inclined surface 15c. The inclined surface 15c is provided on the side surface of the first main body portion 7a. The inclined surface 15c is connected to the first incident surface 7b.

  In this case, the irradiation light from the light source 3 is incident on the first incident surface 7b of the first main body portion 7a. The diffused light of the light incident on the first incident surface 7b of the first main body portion 7a is reflected by the inclined surface 15c and travels toward the reflective surface 7c. In this way, the diffused light is adjusted by the inclined surface 15c of the first main body portion 7a.

  Thereby, the directivity of the irradiation light can be improved. That is, the conversion unit 7, for example, the reflection surface 7c can be downsized.

  (C3) The light limiting portion 15 of the above embodiment may be provided on the side surface of the first main body portion 7a, as shown in FIG. 18D. In this case, the light limiting section 15 is composed of the absorbing member 15d. The absorbing member 15d is attached to the side surface of the first main body portion 7a. The absorbing member 15d may be applied to the side surface of the first main body portion 7a.

  In this case, the irradiation light from the light source 3 is incident on the first incident surface 7b. At this time, the diffused light of the light source 3 is absorbed by the absorbing member 15d. Thereby, the directivity of the irradiation light can be improved. That is, the conversion unit 7, for example, the reflection surface 7c can be downsized.

  (C4) As shown in FIG. 18E, the light restricting portion 15 of the above embodiment may be configured by forming the first incident surface 7b of the first main body portion 7a in a convex shape. In this case, the irradiation light from the light source 3 is incident on the convex first incident surface 7b. At this time, the irradiation light from the light source 3 is bent by the first incident surface 7b so as to travel toward the reflecting surface 7c. In this way, the diffused light of the light source 3 is adjusted by the first incident surface 7b. Thereby, the directivity of the irradiation light can be improved. That is, the conversion unit 7, for example, the reflection surface 7c can be downsized.

[Fifth Embodiment]
The basic configuration of the fifth embodiment is substantially the same as that of the first to fourth embodiments. Therefore, in the following, a configuration different from the first to fourth embodiments will be described. The configurations omitted in the fifth embodiment are the same as those in the first to fourth embodiments.

  As shown in FIG. 19, the conversion unit 7 further includes a condensing unit 7e that condenses the irradiation light emitted from each of the plurality (for example, three) of the light sources 3c, 3d, and 3e.

  For example, the light collector 7e is provided in the first main body 7a. The condensing part 7e may be provided integrally with the first main body part 7a or may be provided separately from the first main body part 7a.

  The light collecting section 7e has a plurality of light guide tube sections 7e1, 7e2, 7e3. The plurality of light guide tube portions 7e1, 7e2, 7e3 respectively guide the plurality of irradiation lights to the first incident surface 7b. Specifically, the plurality of light guide tube portions 7e1, 7e2, 7e3 are arranged such that the optical axes K1, K2, K3 of the respective light sources 3c, 3d, 3e intersect at one point.

  In this case, since the irradiation light emitted from each of the plurality of light sources 3c, 3d, 3e can be condensed by the condensing unit 7e, irradiation light with high illuminance can be generated. That is, since high-illuminance collimated light can be generated, a high-luminance image E can be displayed.

[Sixth Embodiment]
The basic configuration of the sixth embodiment is substantially the same as that of the first to fifth embodiments. Therefore, in the following, configurations different from those of the first to fifth embodiments will be described. The configurations omitted in the sixth embodiment are the same as those in the first to fifth embodiments.

  As shown in FIGS. 20A and 20B, the imaging unit 9 is formed integrally with the conversion unit 7 and is arranged in a direction intersecting with the traveling direction of the collimated light. Specifically, the image forming unit 9 is formed integrally with the converting unit 7, and is arranged in a direction orthogonal to the traveling direction of the collimated light.

  In this case, the irradiation light emitted from the light source 3 is incident on the first incident surface 7b of the conversion unit 7. Collimated light is generated by reflecting this irradiation light by the reflecting surface 7c. The collimated light travels toward the imaging unit 9 inside the conversion unit 7 (first main body unit 7a), and travels in a direction intersecting the conversion unit 7 at the connection between the conversion unit 7 and the imaging unit 9. The collimated light is reflected to the side of the image forming unit 9 by the image generating unit 9b of the image forming unit 9. As a result, the image E is displayed on the side of the image forming unit 9 (see FIG. 20B).

  With this configuration, the image E can be displayed at a distance from the plane on which the conversion unit 7 is arranged, so that the viewer can see the image E from the side of the image forming unit 9 (outside the lamp cover T). In this case, since the conversion unit 7 cannot be seen behind the image E, the image E can be suitably viewed. Moreover, the dead space or the like can be effectively utilized.

[Seventh Embodiment]
The basic configuration of the seventh embodiment is substantially the same as that of the first to sixth embodiments. Therefore, in the following, a configuration different from the first to sixth embodiments will be described. The configurations omitted in the seventh embodiment are the same as those in the first to sixth embodiments.

  As shown in FIGS. 21A to 21C, the light guide plate 5 further includes a light emitting portion 17 that emits light around the image E. In this case, the light emitting unit 17 is provided in the image forming unit 9. For example, the light emitting portion 17 is provided on the second main body portion 9 a of the image forming portion 9. Specifically, the light emitting portion 17 is provided at the end portion of the second main body portion 9a in the traveling direction (Y direction) of the collimated light.

  The light emitting portion 17 is formed so as to emit light from the second main body portion 9a to the image E side. For example, as shown in FIG. 21B, the light emitting portion 17 has a sloped portion 17a. The inclined portion 17a is inclined on the image E side. Further, as shown in FIG. 21C, the light emitting portion 17 may have a bending portion 17b that bends from the second main body portion 9a toward the image E side.

  In this case, the light that has passed through the second main body 9a of the image forming unit 9 is emitted from the light emitting unit 17 around the image E. Thereby, the brightness around the image E can be increased. That is, the brightness of the space where the image E is displayed can be increased.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  (1) The display device 1 of the above embodiment may display a stereoscopic image E or a planar image E. Further, the display device 1 may simultaneously display the stereoscopic image E and the planar image E. Further, the display device 1 may switch and display the stereoscopic image E and the planar image E.

  (2) The light guide plate 5 of the display device 1 in the above embodiment may have an evaluation pattern P for evaluating the characteristics of the light guide plate 5. In this case, for example, as shown in FIG. 22A, the evaluation pattern P is provided on the light guide plate 5, for example, the conversion unit 7 (first main body unit 7a) at a position different from the image generation unit 9b.

  Here, when the collimated light is reflected by the evaluation pattern P, an image for the evaluation pattern is displayed at a position different from the image E. The characteristics of the light guide plate 5 can be evaluated by evaluating the image for this evaluation pattern. 22B to 22E show an example of the evaluation pattern P.

  (3) In the above-described embodiment, an example in which the display device 1 is applied to a tail lamp illumination device (vehicle illumination device) is shown, but the display device 1 is also applicable to other devices. Is.

  For example, the display device 1 is also applicable to an input device. In this case, as shown in FIG. 23, the input device 101 includes the above-described display device 1 and the sensor unit 110 that detects an object approaching the image E.

  For example, the sensor unit 110 is a proximity sensor that detects an object in a non-contact manner. Here, the sensor unit 110 uses infrared rays to detect an object approaching the image E.

  The sensor unit 110 is, for example, a photoelectric sensor. The sensor unit 110 includes a light projecting element 110a and a light receiving element 110b.

  The light projecting element 110a irradiates the image E with infrared rays. The light receiving element 110b receives the infrared light reflected by the object. The sensor unit 110 outputs a signal indicating the detection result to the controller 50.

  Specifically, the sensor unit 110 is a limited reflection sensor. The limited reflection sensor detects the presence of an object when the object is located at a predetermined detection position P.

  The limited reflection sensor may detect the presence of the object when the object is located at at least one of the plurality of predetermined detection positions P. In the present embodiment, the predetermined detection position P is included inside the image E.

  By configuring the input device 101 in this way, the input device 101 can be operated as an operating device such as a switch.

  According to the present invention, the image E can be preferably formed in the display device 1 and the vehicle lighting device.

1 display device 3 light source 3a first light source 3b second light source 5 light guide plate 7 conversion unit 7a first main body unit 7b first incident surface 7b1 light intensity adjusting unit 7c reflection surface 7c1 first reflection surface 7c2 second reflection surface 7c3 third reflection Surface 7c4 Fourth reflecting surface 7c5 Fifth reflecting surface 7d Transmitting surface 7e Condensing portion 7f Light shielding portion 8 Prism 9 Image forming portion 9a Second main body portion 9b Image generating portion 11 Wide-angle light removing portion 12 First wide-angle light removing portion 13th 2 Wide-angle light removal section 15 Light restriction section 17 Light emission section E Image H Emission width

Claims (23)

A conversion unit that converts incident light into collimated light,
An image forming unit which is formed integrally with the conversion unit and forms an image of a predetermined pattern by the collimated light,
A light guide plate. The conversion unit has a first main body, and a reflection surface that is provided in the first main body and that generates the collimated light by reflecting the incident light,
The image forming unit includes a second main body part formed integrally with the first main body part, and a pattern generating part provided in the second main body part for forming an image of the predetermined pattern.
The light guide plate according to claim 1. The reflective surface is formed in an aspherical shape,
The light guide plate according to claim 2. The reflective surface has a plurality of recesses,
The light guide plate according to claim 2. The conversion unit has a plurality of reflection surfaces that individually reflect the plurality of incident lights.
The light guide plate according to any one of claims 2 to 4. According to the illuminance of the incident light reaching the reflecting surface, the reflecting surface is formed so that the illuminance of the collimated light reaching the imaging unit is made uniform.
The light guide plate according to claim 2. A wide-angle light removing unit that removes a wide-angle component of the incident light,
The light guide plate according to claim 1, further comprising: The wide-angle light removing unit is provided between an incident unit on which the incident light is incident and the conversion unit,
The light guide plate according to claim 7. The wide-angle light removal unit is provided in the conversion unit,
The light guide plate according to claim 7. The conversion unit includes a first body, a first reflection surface that reflects the first incident light, and a second reflection surface that reflects the second incident light.
The wide-angle light removing unit includes a first wide-angle light removing unit that removes a wide-angle component of the first incident light and a second wide-angle light removing unit that removes a wide-angle component of the second incident light.
The first wide-angle light removing section is provided on at least one of the first main body section and the second reflecting surface,
The light guide plate according to claim 9, wherein the second wide-angle light removing portion is provided on at least one of the first main body portion and the first reflecting surface. The reflecting surface includes a non-vapor-deposited third reflecting surface that reflects the incident light, and a fourth reflecting surface that converts the reflected light reflected by the third reflecting surface into the collimated light.
The light guide plate according to claim 2. The reflecting surface further includes a fifth reflecting surface that reflects a wide-angle component of the incident light,
The third reflecting surface is arranged so that the reflected light reflected by the fifth reflecting surface can be transmitted.
The light guide plate according to claim 11. The conversion unit further includes a transmissive surface arranged to transmit a wide-angle component of the incident light.
The light guide plate according to claim 11. A light-blocking portion that blocks transmitted light is provided on the transparent surface,
The light guide plate according to claim 13. The transparent surface is formed in a tapered shape,
The light guide plate according to claim 13 or 14. The first body portion has an incident portion on which the incident light is incident,
The incident unit includes a light intensity adjusting unit that adjusts a light intensity distribution of the incident light,
The light guide plate according to any one of claims 2 to 15. A light limiting section for limiting the diffusion of the incident light,
17. The light guide plate according to any one of 1 to 16, further comprising: The conversion unit further includes a light collecting unit that collects the plurality of incident lights.
The light guide plate according to any one of 1 to 17, further comprising: The predetermined pattern is imaged in a direction intersecting a direction in which the collimated light travels,
19. The light guide plate according to any one of 1 to 18, further comprising: A light emitting portion that emits light around the predetermined pattern,
The light guide plate according to any one of 1 to 19, further comprising: A light guide plate according to any one of claims 1 to 20,
A light-emitting body that irradiates the incident light;
A display device including. A display device according to claim 21,
A sensor unit for detecting an object approaching the predetermined pattern,
An input device including. The display device according to claim 21,
An illumination device for a vehicle including the.

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